Which component of the inguinal canal floor forms the medial boundary of the deep inguinal ring, and is the structure that differentiates indirect from direct inguinal hernias on inspection during surgery?

• A Transversalis fascia thickening — the interfoveolar ligament (Hesselbach's ligament) medial to the deep ring
• B Inguinal ligament forming the floor throughout
• C The inferior epigastric vessels form the lateral boundary of Hesselbach's triangle; indirect hernia passes lateral to them, direct medial to them ✓
• D Conjoint tendon medially, with the deep ring lying within Hesselbach's triangle

Explanation

The inferior epigastric vessels (arteria and vena epigastrica inferior) form the lateral boundary of Hesselbach's (inguinal) triangle. During open inguinal hernia repair, the relationship of the hernial sac to these vessels distinguishes the type: indirect hernias pass lateral to (outside) the inferior epigastric vessels through the deep ring, while direct hernias bulge medial to these vessels through a weakness in the posterior wall within Hesselbach's triangle. This anatomical distinction is confirmed intraoperatively by opening the external oblique aponeurosis and identifying the vessels.

Reference: Bailey & Love's Short Practice of Surgery, 27th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.